Gear puller



C. R. HARSH May 13, 1958 GEAR FULLER Filed Aug. 11, 1954 30 INVENTOR. CARL R. HARSH BY JaWu X ,2 W

ATTORNEYS.

United States Patent '0 GEAR PULLER Carl R. Harsh, Newton, Iowa Application August 11, 1954, Serial No. 449,137

1 Claim. (Cl. 29-261) My invention relates to improvements in pulling or extracting tools and is more particularly adapted for pulling gears and the like.

This new tool employs the use of adjustable jaws which is a well known and common characteristic of tools in this class but which are so formed as to overcome some of the inherent problems and disadvantages that such tools appear to possess.

Most gear pulling tools using the jaw principle have one means or another for adjustably opening the jaws to lit the dimensions of the particular gear but I have found that such tools do not provide a simple suitable means to prevent the jaws from accidentally opening wider than necessary and this frequently occurs with the result that the intended gripping action is lost. Likewise it has been my experience that the jaws on such tools may under tension tighten excessively and damage the gear.

With these observations in mind it is one of the important objects of this invention to provide a jaw type gear pulling tool having means to prevent the opening of the jaws past any predetermined point.

Another object of this invention is to provide a gear pulling tool of the above class which can be adjusted to prevent the jaws from closing past a predetermined spacing.

Still another object of my invention is to provide a tool as characterized wherein the means for accomplishing the first two objects stated can be used separately or simultaneously.

Other objects of my invention are to provide a novel gear pulling tool that is economical in manufacture, simple but durable in structure and extremely etficient for its intended use.

These and other objects will be apparent to those skilled in the art.

My invention consists in the construction, arrangement, and combination of the various parts of the device, whereby the objects contemplated are attained as hereinafter more fully set forth, specifically pointed out in my claim, and illustrated in the accompanying drawings, in which:

Fig. l is a perspective view of a gear pulling tool formed as a preferred embodiment of my invention, and

Fig. 2 is a cross sectional view thereof taken on the line 22 of Fig. 1.

Referring to the drawings an elongated block member or crosshead is designated'at and is slotted or otherwise formed at each respective end portion to provide the channel-like recesses 12 and 14. A cross member 16 bridges the slot 12 intermediate its ends at the top of the block 10 and a like member 18 is similarly arranged relative to slot 14. As illustrated, block 10 and members 16 and 18 are integrally formed but it is pointed out that block 10 can be made from a pair of bar members secured in parallel spaced relationship by members 16 and 18 to obtain the same result.

Jaw members shown generally at 20 and 22 are pivotally arranged in the respective slots 12 and 14 as follows.

2,834,100 Patented May 13, 1958 Each jaw has the arm 24 terminating at its lower end in the claw 26 and at its upper end is provided with substantially L-shaped shoulder 28. These jaws are pivotally removably attached by pins 30 at the heel point formed by shoulders 28 with arms 24 in the slots 12 and 14 and it will be understood that when so mounted the shoulders 28 and claws 26 on the respective jaws will extend toward each other. Thus far described, this structure is not dissimilar from many other jaw type pulling tools and the novelty of my invention resides in means to control the limits of movement of the jaws which I shall now describe.

Shoulders 28 in operable position as shown are further identified by the respective outer surface 32 and inner surface 34. Surface 32 extends substantially at right angles from jaw arm 24 and is provided with the groove or depression 36 near the outer extremity thereof to register with the respective cross members 16 and 18 as shown in Fig. 2. This arrangement obviously increases the distance jaws 20 and 22 can move toward each other over what would be the effect if surface 32 were straight because of the relative position of cross members 16 and 18 which serve as stops as is apparent in Fig. 2. Members 16 and 18 are provided with threaded openings therethrough for receiving the. bolts or studs 38 which can be adjustably set relative to depressions 36 to limit the movement of jaws 20 and 22 toward each other at any desired spacing of the claws 26. Thus in effect, studs 38 merely increase the thickness of the stops represented by members 16 and 18 to shorten the distance of travel of shoulders 28 in one direction.

The inner surface 34 of shoulders 28 extends from arm 24 upwardly and then downwardly in a radius or curved path for engagement with a control plate or bar 40 as follows: An externally threaded pilot rod 42 topped by an integral cap 44 is slidably positioned through an opening 46 in block 10 so that its major length is disposed between jaws 20 and 24 where point 48 can engage a shaft 50 while claws 26 are gripping the gear 52 to be pulled therefrom in a manner well known in the art. Control bar 40 is formed to be threadably received'at its longitudinal center by rod 42 where it extends in opposite directions therefrom sufficiently to engage the surfaces 34 of shoulders 28 and can thus be selectively positioned to limit the movement of the jaws away from each other at any desired setting. Those portions of bar 40 which engage surfaces 34 are provided with longitudinal grooves or recesses 54 to serve as guide tracks on which the radius of the respective surfaces 34 can move.

Thus constructed and arranged it will be appreciated that jaws 20 and 22 can be locked against movement beyond a given position toward each other and likewise locked against movement beyond a given position away from each other, and that both locking means can be used simultaneously to hold the jaws immovable in any direction from a desired setting. With this tool set for pulling as shown in Fig. 2, cap 44 can be tapped with a hammer or the like to release the gear.

It is submitted that the invention shown and described is aptly suited to achieve the purposes intended and is characterized by a combination of highly useful and mutually cooperating elements that combine their respective and proportionate functions in accomplishing the objects sought to be obtained.

Some changes may be made in the construction and arrangement of my gear puller without departing from the real spirit and purpose of my invention, and it is my intention to cover by my claim, any modified forms of structure or use of mechanical equivalents which may be reasonably included within their scope.

I claim:

In a pulling tool, a block member provided with a 3 slot on two opposite ends, a jaw member pivotally secured to the outer end of each respective slot and extending therefrom in the same direction so as to be movable toward and away from each other, an integral shoulder on each jaw at its pivot point, said shoulders movable in said respective slots when said jaws are moved, a set screw threaded through said block member for adjustable engagement with the shoulder of one of said jaw I 1 members, a second set screw threaded through said block member for adjustable engagement with the shoulder of the other said jaw member, said block member provided with a transverse opening, a rod loosely slidably disposed through said opening so 'that its major portion can be intermediate of said jaws, and a plate threaded on said rod and engageable with said shoulders of said jaw members, to limit their movement in one direction; said set screws and said plate operable together to adjustably limit any movement of said: jaws from a predetermined position.

References Cited in the file of this patent UNITED STATES PATENTS 1,313,511 Beach Aug. 19, 1919 1,644,839 Landrum Oct; 11, 1927 1,688,535 Ellis et a1. Oct. 23, 1928 2,109,740 Carlborg Mar. 1, 1938 2,136,004 Cornwell Nov. 8, 1938 FOREIGN PATENTS 34,229 Austria Sept. 10, 1908 

